Transparent packaging means that it is easy to see light, and milk is afraid of seeing light, which will destroy the fat of milk and easily produce photooxidation.

This kind of milk can be easily cut. If you put it in your backpack and scrape it with something sharp, the backpack will be full of milk. And as we all know, these fresh milk need to be refrigerated at low temperature and kept away from light, but in general, the freezer in the supermarket can only be treated at low temperature.

As for avoiding light, it is still difficult to do it, because in order to let customers choose their favorite products at a glance, many lights are usually installed, but this will not achieve the effect of avoiding light, so transparent packaging bags are easy to lose nutrients in milk.

There are mainly two kinds of non-fermented liquid milk sold in the market. One is pasteurized milk. At 135℃- 150℃, raw milk is instantly sterilized for 4- 15 seconds, which is also commonly known as normal temperature milk. The shelf life can reach one month or even several months. ?

The other is low-temperature pasteurized milk, that is, raw milk is heated to 72℃-85℃, instantly killing pathogenic microorganisms and retaining beneficial bacteria. Pasteurized milk fully maintains the freshness of milk, but it can only be stored at low temperature, and the shelf life usually ranges from 48 hours to 7 days.